Boiler



Feb. 6, 1940. J. F. DICKSON 2,189,135

I BOILER Filed June so, 1939 2 Sheets-Shet 1 Feb. 6, 1940. J. F. D-ICKSON BOILER Filed June 30, 1939 2 Sheets-Sheet 2 corporatidn of nDelawa re e iimer portibii pi -the outer I he Cover in place. 55

24 :into the chamber 59 where they come'into direct." contact with the hot refractory-block 55 30 A smoke or burned-gas outlet-conduit, is

located on the upper portion of such cover, and,

of course, it communicates directly with that chamber 32 of the interior of the box connected to the rear ends of theupper group of tubes 48.

Detachably fastened to the lower portion of the inner face of such cover is a refractory-block 55 fitted with bolts 56 partially imbedded therein and arranged toextend rearwardly through holes 51 through the cover, the protruding ends of the shanks of such bolts being fitted with the usual confining nuts 58.

The surface of such refractory-element 55, which bears against the innerlface of the coverplate 50, is fiat or plane, as isialso" its; lower; surface just above the top of plate 28 and upper surface on a level to fit beneath plate 38 in small degree as illustrated Figure 1;

v The inner surface of therefractory-blockis curved to conform to the exterior surface of they internal shell l1 and such, block is slightly thicker at'its top than at its'botto'm, all as is clearly pres'ented in the drawings.

1 From what precedes, it should be apparent that the hot combustion-gases originating in the firebox shell I! ascend and are efliciently directed, at least in part, by the arched 'or domed top-wall which action aids in developing aneflective and complete combustionof the gases which flow forwardly through, the lower group of tubes into the front smoke-box 45 from which they' pass rearwardly" through the upperitubes or fiues 48 into the chamber 32 from which they escape 1 through the discharge conduit or flue 54 to -thestack or chimney. d Bymounting the stated refractory-member in the position indicated, the advantageous "recited result occurs, and it is to be noted that such member may be removed with the demountable cover if substitution is required, due to injury or deterioration of the block in servicaor, if occasion requires, the cover alone canbe detached,

leaving the refractory-element in place.

If any: of the upper group of tubes or flues necessitate replacement with one or more new ones, therear ends of the substituted ones are, rendered accessible for easy and direct flanging by demounting the cover, either with or Without the refractory-block,

In similar manner, if any of the tubes or flues ,of the lower-group require substitutionbypne or more new ones, then the back ends of the new one or ones can be conveniently flanged or rolled over-in place by removal of the cover, and the refractory-member Theready approach to the rear ends ofthe two series of flues ortubes may be availed ;.of-

to remove the damaged or worn-out one or ones from the boiler, as well as tointroduce and secure in place the fresh one or ones. The scope of the present invention,

structural changes 'orlmodifications may be'resorted to without departure from the heart and essence of the invention and without; the loss'or sacrifice of any of-its desirable and material benefits'and advantages:

It will be observed,-that in theparticular, em-.

bodiment of the invention herein pointed out, the

cylindrical fire-box shell and the novel vrectangu larbox are both cut away toallow their proper .interfittingtogether ;.to permit the, desiredpassage of the gases from the fire-chamber into the as defined by the following claims, indicates that various 'semblage of tubes, but the invention, in its broader aspects, is not confined to such indicated structural details.

Also it will be noted that the refractory-element '55 is so located that it adequately protects the metal cover or closure from the heat in the boiler, that it overlies and, in some cases, may rest upon thejbottom-wall 28. of the boxing 21, and that it acts as a division-wall between the chamt, bers or compartments 59 and 32, thus causing the hot-combustion gases to traverse their passages to best functional, advantage.

, I claim;

1. In around-boiler, the combination of an :outer cylindrical shell having a rectangular opening through its rearportion, a top-wall for said shell, a shorter cylindrical fire-box shell of less diameter than that of said outer shell inside of the lower portion of said outer shell and spaced inwardly therefrom, the upper rear portion of said inner shell being cut away on intersecting ver wtical and'horizontal planes, means connecting together the lower portions of said two shellsthereby forming an annular water-leg surrounding said fire-box, an upwardly-rearwardly-inclined domed top-wall for said fire-boxat'least partially abovethe top edge of said inner shell, a rectangular-boxing occupying said outer shell opening and extending both inside of the boiler and'outside thereof, the lower wall of said boxing conforming to and secured to said'inner shell and secured to said outer'shelLthe inner part of the lower'portion of said boxing in the boiler having I a first upright apertured tube-sheet arched at its lower portion to receive and secured to the rear part'of said fire-box top-wall, an intermediate part of the upper portion of said boxing having a second upright apertured tubesheet, a cross-wall connecting the top portion of said first tube-sheet and the lower portion of said second tube-sheet, a smoke-box at the front of the outer shell having an apertured tubesheet, a lower group of tubes occupying apertures in said first tube-sheet and said "smoke-box tubesheet, an upper group of tubes occupying apertures in said smoke-box tube-sheet and said second tube-sheet, a removable cover for the back compartment leading to the first or lower asof s aidboxing, and a refractory-block demount'- ably securedto said cover and having a curved inner surface adjacent to and conforming to the curvature of said inner shell and-of ahei'ght substantially equal to the distance between the bottom wall of said boxing and said boxing crosswall. I

fire-box, a boxing conforming to and occupying said outer shell opening and extending both inf side of the boiler and outsidethereof, a portion of said. boxing wall conforming to and secured to said inner shell and secured to said outer shell, first and second apertured tube-sheets in said boxing, a smoke-box at the front of the outer shell having an apertured. tube-sheet, a lower group of tubes occupying apertures in said first tube-sheet and said smoke-box tube-sheet, an

conforming to the outer surface of said inner upper group of tubes occupying apertures in said smoke-box tube-sheet and said second tubesheet, the upper portion of said fire-box communicating with the interior of said boxing to the rear of said lower group of tubes, a removable cover for the backof said boxing, and a refractory-block in front of said cover and having a curved inner surface conforming to the curvature of said inner shell and with which the hot gases from the fire-box contact before they pass forwardly through the lower group of tubes.

3. In a boiler, the combination of an outer shell having an opening through its rear portion and a top-wall, a shorter smaller fire-box shell inside of the lower portion of said outer'shell and spaced inwardly therefrom, the upper rear part ofsaid inner shell being cut away, means connecting together the lower portions of said two shells thereby forming a Water-leg surrounding said fire-box, an upwardly-rearwardly-inclined domed topwall for said fire box and at least partially above the top edge of said inner shell, a boxing occupying and conforming to said outer shell opening and extendinginside of the boiler, a lower wall of said boxing conforming to and secured to said inner shell and secured to said outer shell, the inner part of the lower portion of said boxing having a first apertured tube-sheet recessed in its lower portion to re:

ceive and secured to the rear part of said fire-box top-wall, the upper-portion of said boxing having a second apertured tube-sheet, a cross-wall connecting the top portion of said first tube-sheet with the lower portion of said second tube-sheet,

"a smoke-box at the front of the outer shell having an apertured tube-sheet, a lower group of tubes occupying the apertures in said first tubesheet and in said smoke-box tube-sheet, an upper group of tubes occupy apertures in said smoke-box tube-sheet and in said second tube-sheet, a removable-cover for the back of said boxing, and a refractory-block demountably secured to said cover and having an inner surface shell and another surface beneath and conforme ing to said cross-Wall preventing the gases from passing from the lower part to the upper part of said boxing without flowing through said groups of tubes.

4. In aboiler, the combination of an outer shell having an opening throughits rearportion and a top-wall, a shorter smaller fire-box shell inside of the lower portion of said outer shelland spaced inwardly therefrom, means connecting together the lower portions of said two shells thereby forming a water-leg surrounding said fire-box, an upwardly-rearwardly-inclined topwall for said fire-box,a boxing occupying and conforming to said outer shell opening and extending inside of the boiler, a lower wall of said boxing conforming to and secured to said inner shell and secured to said outer shell, the lower,

portion of said boxing in the boiler having a first apertured tube-sheet, the upper portion of said boxing having a second apertured tubesheet, a cross-wall connecting the top portion of said first tube-sheet with the lower portion of said second tube-sheet, a smoke-box at the front of said outer shell having an apertured tube- ,sheet, a lower group of tubes occupying the apertures in said first tube-sheet and in said smoke-box tube-sheet, an upper group of tubes occupying apertures in said smoke-box tubesheet and in said second tube-sheet, a removablecover for the back of said boxing, and a dewmountable refractory-block in front of and protecting said cover, said fire-box at its rear upper portion communicating with the interior of said boxing to the rear of said first group of tubes and in front of said refractory-block, said refractory-block having an inner surface con-' forming to the outer surface of said inner shell 

